Effect of different elementary processes on the breakdown in low-pressure helium gas

Hartmann, P.; Bánó, Gregor; Szalai, L.; Rózsa, K.

doi:10.1088/0963-0252/9/2/311

Cited by 62 publications

(45 citation statements)

References 45 publications

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“…The code is still under development but important features of the discharges in helium can already be reproduced. [9]. The region in which the simulations predict an enhanced secondary electron production follows this border line.…”

Section: Breakdown Calculationsmentioning

confidence: 80%

“…Electrical breakdown in gases is one of the most fundamental phenomena in gas discharge physics. For plane-parallel electrode arrangements it has been found that the breakdown voltage is a function of the product of gas pressure (p) and electrode separation (d), V BR = f (pd) [9]. While discharges in the case of static (DC) potentials have been studied widely, information on discharges in the case of RF voltages is scarce.…”

Section: Minimizing Electrical Breakdownsmentioning

confidence: 99%

“…The code performs a microscopic simulation of all critical collision processes in a discharge in helium gas, largely following procedures discussed in [9]. The particle types involved are electrons, helium ions, and helium atoms.…”

Section: Breakdown Calculationsmentioning

confidence: 99%

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Towards cooling of high-intensity ion beams

et al. 2006

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Buffer gas beam coolers may become excellent beam preparation devices for high-resolution mass separation. The small beam emittance provided makes efficient isobar resolution a realistic goal. In order to fulfill the needs of future facilities providing high-intensity beams of rare isotopes, it is desirable to increase the beam intensity limit of such devices from typically several tens of nanoamperes to microamperes. This requires the usage of high-voltage radiofrequencies in a lowpressure gas environment. A buffer gas beam cooler, dedicated to this purpose, is under development at the NSCL. The study of voltage breakdowns under such conditions and the design of an electrode system minimizing them is mandatory.

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Section: Breakdown Calculationsmentioning

confidence: 80%

Section: Minimizing Electrical Breakdownsmentioning

confidence: 99%

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Towards cooling of high-intensity ion beams

et al. 2006

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“…Earlier developed models of breakdown in helium [8] are not able to explain such ultra-fast development of current. The electron emission from the cathode due to ions/fast atoms bombardment is usually considered as a main process of breakdown development in abnormal glow discharge.…”

Section: Introductionmentioning

confidence: 94%

Subnanosecond breakdown development in high-voltage pulse discharge: Effect of secondary electron emission

Alexandrov

Schweigert

Zakrevskiy

et al. 2017

AIP Conference Proceedings

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Abstract. A subnanosecond breakdown in high-voltage pulse discharge may be a key tool for superfast commutation of high power devices. The breakdown in high-voltage open discharge at mid-high pressure in helium was studied in experiment and in kinetic simulations. The kinetic model of electron avalanche development was constructed, based on PIC-MCC simulations, including dynamics of electrons, ions and fast helium atoms, produced by ions scattering. Special attention was paid to electron emission processes from cathode, such as: photoemission by Doppler-shifted resonant photons, produced in excitation processes involving fast atoms; electron emission by ions and fast atoms bombardment of cathode; the secondary electron emission (SEE) by hot electrons from bulk plasma. The simulations show that the fast atoms accumulation is the main reason of emission growth at the early stage of breakdown, but at the final stage, when the voltage on plasma gap diminishes, namely the SEE is responsible for subnanosecond rate of current growth. It was shown that the characteristic time of the current growth can be controlled by the SEE yield. The influence of SEE yield for three types of cathode material (titanium, SiC, and CuAlMg-alloy) was tested. By changing the pulse voltage amplitude and gas pressure, the area of existence of subnanosecond breakdown is identified. It is shown that in discharge with SiC and CuAlMg-alloy cathodes (which have enhanced SEE) the current can increase with a subnanosecond characteristic time value as small as τ s = 0.4 ns, for the pulse voltage amplitude of 5÷12 kV. An increase of gas pressure from 15 Torr to 30 Torr essentially decreases the time of of current front growth, whereas the pulse voltage variation weakly affects the results.

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“…Available papers contain a broad range of conditions for igniting a self-sustained rf discharge in various gases (see, e.g., [8][9][10][11] and the references cited therein). Dc discharge ignition is also studied in sufficient detail, e.g., in [12][13][14][15][16]. But the question of igniting a longitudinal combined discharge was not subjected to such a broad study.…”

Section: Introductionmentioning

confidence: 99%

Low-pressure gas breakdown in longitudinal combined electric fields

Lisovskiy¹,

Kharchenko²,

Yegorenkov³

2010

J. Phys. D: Appl. Phys.

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This paper contains the complete experimental and analytical picture of gas breakdown in combined electric fields for arbitrary values of rf and dc fields. To obtain it, we continued the study of the discharge ignition modes in nitrogen with simultaneous application of dc and rf electric fields presented in Lisovskiy et al (2008 J. Phys. D: Appl. Phys. 41 125207). To this end, we studied the effect of rf voltage on dc discharge ignition. When we applied an rf voltage exceeding the one corresponding to the minimum breakdown voltage of a self-sustained rf discharge, the curve of dependence of the dc breakdown voltage of a combined discharge on gas pressure was found to consist of two sections. We got the generalized gas breakdown criterion in the combined field valid for arbitrary values of rf and dc electric fields. The calculation results agree with experimental data satisfactorily.

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Effect of different elementary processes on the breakdown in low-pressure helium gas

Cited by 62 publications

References 45 publications

Towards cooling of high-intensity ion beams

Towards cooling of high-intensity ion beams

Subnanosecond breakdown development in high-voltage pulse discharge: Effect of secondary electron emission

Low-pressure gas breakdown in longitudinal combined electric fields

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